I've binge watched the show from season 1 to season 2 in one go and for me it was clear from the beginning who she would end up with. She felt physically attracted by one (kinda problematic) guy, but on the long run started a family with someone more similar and stable. It's actually realistic. When she disappeared from the potentials I knew it was because she is 100% in love from that point, because she let go of her past and was sure now.
I wish they showed the creator more. Maybe they could make a spin-off with the new app for lie detection.
Overall it wasn't as terrible as I've expected because of the ratings. It's nice to see a k-drama where the protagonist changes her love interests over the course of time, instead of the "virgin that marries the first love" cliché. I also like shows that think over the impact of the technology on our lives and it's evolution in history.